New synergies between the new and the old

Located very close to Gare Saint-Lazare, these next-generation offices that are set up in  former military barracks build upon the features of the existing construction, which dates from two different historical periods. They derive the best of each of these two architectural legacies to offer a specific, comfortable, and prestigious workplace, geared towards nature and the well-being of its future occupants, Gide Loyrette Nouel law firm. This heritage property is fully magnified and remodeled, gaining in attractiveness and competitiveness, all the while contributing to writing a new page in the history of a constantly transforming piece of the urban fabric of Paris.

A long gone prestigious military past

The Pépinière barracks were built at the end of the eighteenth century for the French Guards, the elite regiment responsible for the protection of the King of France. Opening onto the Place Saint-Augustin, its U-shaped layout around a large courtyard facilitated military inspections. It was extensively remodeled during the Second Empire to accommodate up to 1500 men, then partially demolished and rebuilt in 1925 when the Cercle National des Armées (the National Officers Club) was constructed on the location of the barracks’ monumental entrance.
In the post-war years, in order to meet the growing needs of the French army, the rear wing was demolished and replaced by a building that combined offices and barracks.
This very narrow, high-rise building, situated in an oversized courtyard, was resolutely functional and of little architectural interest. In contrast, the building flanking the street remained very Parisian, classical and even military in its precision and austerity. In 2015, the French government parted with the property and PCA-STREAM began to develop its new project.

Rebuilding Paris within itself

PCA-STREAM embodies transformative architecture, a “metabolic” vision of the city, the heritage of which is in constant evolution. PCA-STREAM’s approach is based on an in-depth building diagnosis, the identification of historically relevant elements (in this case, the urban alignment and the classical arrangement of the street-facing façade). The whole is then re-imagined to adapt it to new contemporary functions. Launched in 2015, the project borrows the concept of reconstructive surgery on a large injured body: despite the amputation of its largest pavilion on Place Saint-Augustin, the classical wing flanking the street has been carefully restored to revive the barracks’ former grandeur.

A dialogue between the interior and the exterior

From the outside, the building thus retains its classical Parisian elegance… but once the visitor passes through this heritage building the surprise, as is known to happen in so many Parisian courtyards, is total. The sheer scale of the new building’s glass surfaces is striking. They form a shining, contemporary mirror opposite the eighteenth-century wing. The huge supporting frames take inspiration from the steel T beams typically used in the glass façades of Parisian courtyards. Now 12 meters wide – the minimum for modern service sector use –, the building is broader than before.

Creating a hub

In the center of the courtyard, a brand new pavilion has been added: the “NoPa”. The pavilion’s volumetric aspects pay homage to its vanished predecessor. It connects the historic and modern buildings via a spectacular double-height hallway, while also providing harmony to the layout. Two courtyards of better proportions are thus created: one mineral and intended as a service entrance – emergency services, deliveries – the other vegetal and intended for the occupants, organized around an exquisite garden.

Rebuilding horizontality to foster exchange and collaboration

The tall, narrow barracks embodied the vertical hierarchy of the military. PCA-STREAM has turned this around to promote new, horizontal ways of working and managing. Circulation systems have been designed to allow fluid flow along the length of the building. The floors at the back of the courtyard have been widened to 12 metres. The lift cores are grouped together in one place so that members of staff encounter every day.
The proportion of common areas has been greatly increased, with the creation of spaces designed for informal encounters: kitchens and convivial spaces on each floor; a contemporary restaurant with large tables, which during the day transforms into an informal space for work and collaboration; a vast library with alcoves, where both groups and individuals can come together within the same place. And a central building, the “NoPa”, designed as a hub for resources, discussion and representation. A terrace crowns the pavilion, providing a venue for events. 

A union between transparency and confidentiality

Made entirely of glass surrounding the courtyards, the structure allows its occupants to see one another, even from the opposite sides of the building. The whole space has been conceived to promote encounters, interactions, and knowledge sharing. This represents a genuine paradigm shift for the legal profession, which is based on discretion and confidentiality.
The new staff offices remain individual (or are shared by two or three people), but the partitions are transparent, and some even have writable walls. The acoustics have been designed to guarantee that conversations are not overheard. Most of the offices benefit from a dual internal access point, outdoor balconies, and terraces.

Maximizing physical well-being


Thanks to the floor-to-ceiling windows of the façade, each office benefits from optimal natural light.

Outdoor Spaces

There is also an excellent provision of outdoor spaces. Besides the central garden, the offices offer access to the balconies on every floor. The quiet of the courtyards, the planted terraces or two rooftops provide spectacular panoramic views of Montmartre, the Parisian rooftops and Saint-Augustin church. Circulation is given prominence with staircases on the façades, transforming them into true living spaces: they provide access to the terraces, foster encounters and encourage physical exercise. A multitude of informal and inspiring spaces, allowing people to work flexibly and in harmony with the seasons.


Particular attention has been paid to design and furniture, particularly in the shared spaces, to achieve a very high level of comfort for both staff and clients. The workspaces’ interior design has been entrusted to Archimage.


Besides the double-height lounge, the restaurant, the working café and the library, which together constitute a real living space, an onsite concierge service and 24-hour gym are provided.

Reconnecting the city to nature

STREAM has dedicated five years of research, two publications and dozens of conferences to the subject: office buildings –and the city as a whole– must be regarded as metabolic organisms: alive, co-designed, evolving, and connected to their ecosystems.

Green spaces as a component of architectural design

The modern building design is driven by the desire for a new relationship with nature in urban areas, a relationship that is both simpler and more active. The creation of green spaces is no longer decorative. It now includes the garden, the roofs, and the terraces, creating porosity with the neighboring Augustins park. It provides comfort, biodiversity, and heat insulation.

Urban agriculture for onsite consumption

Freed of technical structures, the rooftop becomes productive. Various aromatic plants grow there, requiring little watering and maintenance. They are cared for and harvested by Topager, gardener-agronomists specialized in urban agriculture. Though the amount of food produced, intended for onsite consumption, remains modest, it significantly improves urban biodiversity and optimizes rainwater management.

A lively courtyard

The central courtyard is luxuriously planted, like an invitation to come and sit down to have lunch, to talk and to work. The landscape project creates the impression that nature is erupting from the floor through the wooden platform. It was created by La Superstructure, which was selected in collaboration with the Chaumont Garden Festival. This approach is inherent to the culture of the studio, which regularly invites other creators, artists, and designers to take part in their projects.

Respect for the environment

The entire project uses the available technology to offer exceptional environmental performance, approved by numerous certification labels while contributing to overall comfort levels. This involves the careful choice of A+ materials (the top class of low-VOC materials), the collection of rainwater for sanitary facilities and water systems, the use of certified wood from sustainably managed forests, as well as the installation of high-performance equipment to reduce the building’s energy consumption.

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Picturing the construction work

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Client ACM
Program Restoration and extension of former military barracks into an office complex
Location 15 rue de Laborde, 75008 Paris
Mission Complete
Surface area 18 879m²
Cost 47 M€ HT
Status Delivered in 2018
Certifications BREEAM Very Good; HQE Renovation Excellent; HQE New Excellent; High Energy Performance Certification
Team Assistant to the Contracting Authority: ARC
Contract Supervisor: Artelia
Structure: Khephren
Façades: VS-A
Environment: Green Affair
Plumbing/HVAC: Barbanel
Acoustics: A&C
Technical Inspection: Qualiconsult
Economist: Delporte
Health and Safety: LM3C
Fire Safety: CSD Faces
Landscaping: Topager, La Superstructure
External Lighting: LUMIERE STUDIO
Office Design: ARCHIMAGE

General Contractor: Eiffage
Façades: GOYER
Locksmithing: AGM
Air Conditioning: LEFORT
Electrician: FIBOR
Landscaping: Topager, Les Jardins de l’Orangerie
Contractor Eiffage

Caption(s) image(s) from the page header

  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM
  • LABORDE © Salem Mostefaoui for PCA-STREAM